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Spectroscopic And Spectro-Astrometric Analysis Of T Tauri Stars, Logan Ryan Brown
Spectroscopic And Spectro-Astrometric Analysis Of T Tauri Stars, Logan Ryan Brown
Dissertations
To understand our own solar origins, we must investigate the composition of the protoplanetary disk from which the solar system formed. To infer this, we study analogs to the early solar system called T Tauri stars. These objects are low-mass, pre-main sequence stars surrounded by circumstellar disks of material from which planets are believed to form. We present high-resolution, near-infrared spectroscopic data for the T Tauri stars DR Tau and AA Tau using NIRSPEC at the Keck II telescope. For DR Tau, a spectro-astrometric analysis was performed, obtaining sub-seeing spatial information on water emission. Alongside a disk model, we constrained …
The Characterization Of Volatiles Associated With Young Stellar Objects, Kari Anne Wojtkowski
The Characterization Of Volatiles Associated With Young Stellar Objects, Kari Anne Wojtkowski
Dissertations
In the first portion of this work, we searched for differences in volatiles within a single star forming region, Rho Ophiuchi. We determined the amount, temperature, and composition of two ice features, the bending modes of CO2 and H2O at 15 μm and 6 μm, respectively, toward 28 Young Stellar Objects (YSOs). We found that more than 50% of the YSOs studied contained a portion of crystalline CO2 ice. We also found that some sources with Flat or borderline Class II Spectral Energy Distributions (SEDs) have a larger abundance of CO2 ice with respect to H2O ice. In addition to …